Move parts of config to shared

shared/config.c

@@ -0,0 +1,118 @@
+/**
+ * Copyright 2021 Johannes Marbach
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+
+#include "config.h"
+
+#include "log.h"
+
+#include <dirent.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/**
+ * Static prototypes
+ */
+
+/**
+ * Checks whether a string ends with a suffix
+ *
+ * @param string string to check
+ * @param suffix suffix to compare to
+ * @return true if the suffix matches at the end of the string, false otherwise
+ */
+static bool string_ends_with(const char *string, const char *suffix);
+
+
+/**
+ * Static functions
+ */
+
+static bool string_ends_with(const char *string, const char *suffix) {
+    if (!string || !suffix || strlen(suffix) > strlen(string)) {
+        return false;
+    }
+    return strncmp(string + strlen(string) - strlen(suffix), suffix, strlen(suffix)) == 0;
+}
+
+
+/**
+ * Public functions
+ */
+
+int bbx_config_compare_strings(const void* a, const void* b) {
+    return strcmp(*(const char**)a, *(const char**)b);
+}
+
+void bbx_config_find_files(const char *path, char ***found, int *num_found) {
+    /* Initialise output variables */
+    *found = NULL;
+    *num_found = 0;
+
+    /* Count length of directory path */
+    const int path_length = strlen(path);
+
+    /* Open directory */
+    DIR *d = opendir(path);
+    if (!d) {
+        bbx_log(BBX_LOG_LEVEL_WARNING, "Could not read contents of folder %s", path);
+        return;
+    }
+
+    /* Loop over directory contents */
+    struct dirent *dir;
+    while ((dir = readdir(d)) != NULL) {
+        /* Ignore anything except for .conf files */
+        if (dir->d_type != DT_REG || !string_ends_with(dir->d_name, ".conf")) {
+            continue;
+        }
+
+        /* Grow output array */
+        char **tmp = realloc(*found, (*num_found + 1) * sizeof(char *));
+        if (!tmp) {
+            bbx_log(BBX_LOG_LEVEL_ERROR, "Could not reallocate memory for configuration file paths");
+            break;
+        }
+        *found = tmp;
+
+        /* Extract file name and length */
+        char *name = dir->d_name;
+        int name_length = strlen(name);
+
+        /* Allocate memory for full path */
+        char *found_path = malloc(path_length + name_length + 2); /* +1 for path separator and null terminator, respectively */
+        if (!found_path) {
+            bbx_log(BBX_LOG_LEVEL_ERROR, "Could not allocate memory for configuration file path");
+            break;
+        }
+
+        /* Build full path */
+        memcpy(found_path, path, path_length);
+        found_path[path_length] = '/';
+        memcpy(found_path + path_length + 1, dir->d_name, name_length + 1); /* +1 for path separator and null terminator, respectively */
+
+        /* Store file path */
+        (*found)[*num_found] = found_path;
+        *num_found += 1;
+    }
+
+    /* Close directory */
+    closedir(d);
+}
+
+bool bbx_config_parse_bool(const char *value, bool *result) {
+    if (strcmp(value, "true") == 0) {
+        *result = true;
+        return true;
+    }
+
+    if (strcmp(value, "false") == 0) {
+        *result = false;
+        return true;
+    }
+
+    return false;
+}

shared/config.h

@@ -0,0 +1,39 @@
+/**
+ * Copyright 2021 Johannes Marbach
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+
+#ifndef BBX_CONFIG_H
+#define BBX_CONFIG_H
+
+#include <stdbool.h>
+
+/**
+ * Compares two strings from opaque types.
+ *
+ * @param a first string as void pointer
+ * @param b second string as void pointer
+ * @return a positive integer if a > b, a negative integer if a < b and 0 otherwise
+ */
+int bbx_config_compare_strings(const void* a, const void* b);
+
+/**
+ * Non-recursively searches a directory for configuration files.
+ * 
+ * @param path folder to search in
+ * @param found pointer to write found configuration file names into (to be freed by the caller)
+ * @param num_found pointer to write number of found files into
+ */
+void bbx_config_find_files(const char *path, char ***found, int *num_found);
+
+/**
+ * Attempt to parse a boolean value.
+ *
+ * @param value string to parse
+ * @param result pointer to write result into if parsing is successful
+ * @return true on success, false otherwise
+ */
+bool bbx_config_parse_bool(const char *value, bool *result);
+
+#endif /* BBX_CONFIG_H */